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  2. Vitamin A - Wikipedia

    en.wikipedia.org/wiki/Vitamin_A

    Vitamin A status involves eye health via two separate functions. Retinal is an essential factor in rod cells and cone cells in the retina responding to light exposure by sending nerve signals to the brain. An early sign of vitamin A deficiency is night blindness. [6] Vitamin A in the form of retinoic acid is essential to normal epithelial cell ...

  3. Xerophthalmia - Wikipedia

    en.wikipedia.org/wiki/Xerophthalmia

    Xerophthalmia (from Ancient Greek xērós (ξηρός) meaning "dry" and ophthalmos (οφθαλμός) meaning "eye") is a medical condition in which the eye fails to produce tears. It may be caused by vitamin A deficiency, [1] which is sometimes used to describe that condition, although there may be other causes.

  4. Bitot's spots - Wikipedia

    en.wikipedia.org/wiki/Bitot's_spots

    A major cause of Bitot's spots is vitamin A deficiency (VAD). [4] Rarely, pellagra due to deficiency of vitamin B 3 (niacin) may also cause Bitot's spots. [5] They can also be caused by Colestyramine , which is a bile acid sequestrant which can reduce the absorption of fat soluble vitamins (Vitamins A, D, E, K)

  5. Retinoid - Wikipedia

    en.wikipedia.org/wiki/Retinoid

    1st, 2nd, 3rd-generation retinoid compounds. The retinoids are a class of chemical compounds that are natural derivatives of vitamin A or are chemically related to it. . Synthetic retinoids are utilized in cosmetic formulations, clinical dermatology, and the treatment of some forms o

  6. Adaptation (eye) - Wikipedia

    en.wikipedia.org/wiki/Adaptation_(eye)

    The human eye can function from very dark to very bright levels of light; its sensing capabilities reach across nine orders of magnitude. This means that the brightest and the darkest light signal that the eye can sense are a factor of roughly 1,000,000,000 apart. However, in any given moment of time, the eye can only sense a contrast ratio of ...

  7. The Top Hair, Skin, and Nail Vitamins for 2024: Best Picks ...

    www.aol.com/entertainment/top-hair-skin-nail...

    Buyer’s Guide: How to Choose the Best Vitamins for Hair, Skin, and Nails in 2024. FAQs . 1. ... Factors like underlying health conditions and diet can make a difference in results. The main key ...

  8. The Best Hair, Skin and Nail Vitamins of 2024 - AOL

    www.aol.com/entertainment/best-hair-skin-nail...

    These include biotin, which is known for increasing the density of hair and boosting growth, fish oil to fight inflammation and reduce sun damage, vitamin A to treat acne, and vitamin C to fight ...

  9. Skin condition - Wikipedia

    en.wikipedia.org/wiki/Skin_condition

    The skin weighs an average of 4 kg (8.8 lb), covers an area of about 2 m 2 (22 sq ft), and is made of three distinct layers: the epidermis, dermis, and subcutaneous tissue. [1] The two main types of human skin are glabrous skin, the nonhairy skin on the palms and soles (also referred to as the "palmoplantar" surfaces), and hair-bearing skin. [16]

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